KR101054410B1 - Door lock switch of washing machine - Google Patents

Abstract

The door lock switch of the washing machine according to the present invention includes a switch casing; A slider movably disposed on the switch casing such that a hook of the door can be engaged / released by the switch casing; A locking pin installed to lock / unlock the slider; A bimetal provided to move the locking pin between a slider locking position and a slider locking release position; A switch provided to be in contact when the locking pin is moved to a slider locking position; It is configured to include a safety lever for moving the locking pin so that the contact of the switch falls when the door is forcibly opened, it is not necessary to install a separate door switch to detect the opening and closing of the door, washing machine structure There is an advantage that can be simplified.

Washing Machine, Door, Hook, Door Lock Switch, Slider, Locking Pin, Switch, Bimetal, Solenoid

Description

Door locking switch of washing machine             

1 is a perspective view of a washing machine according to the prior art,

2 is a control block diagram of a washing machine according to the prior art,

3 is a perspective view of a washing machine with a door lock switch according to the present invention;

4 is a cross-sectional view showing the first embodiment of the door lock switch when the door shown in FIG. 3 is unlocked;

FIG. 5 is a sectional view showing the first embodiment of the door lock switch when the door shown in FIG. 3 is locked;

6 is a cross-sectional view showing the first embodiment of the door lock switch when the door shown in FIG. 3 starts to be forcibly opened;

FIG. 7 is a sectional view showing the first embodiment of the door lock switch after the door shown in FIG. 3 is forcibly opened; FIG.

FIG. 8 is a sectional view showing the second embodiment of the door lock switch when the door shown in FIG. 3 is unlocked; FIG.

9 is a sectional view showing a second embodiment of the door lock switch when the door shown in FIG. 3 is locked;                 

FIG. 10 is a sectional view showing the second embodiment of the door lock switch when the door shown in FIG. 3 starts to be forcibly opened; FIG.

FIG. 11 is a sectional view showing the second embodiment of the door lock switch after the door shown in FIG. 3 is forcibly opened.

<Explanation of symbols on main parts of the drawings>

50: door lock switch 52: casing

53: laundry entrance hall 54: door

55: hook 55a: head

60: switch casing 61; Insertion Hole

63: return spring hanger part 66: hinge pin

67: safety lever retainer 70: slider

71: insertion hole 72: first protrusion

73: second protrusion 80: locking pin

81: upper hanger 82: lower hanger

90: bimetal 91,92: metal

93: heater 100: switch

101: fixed contact 102: movable contact

110: safety lever 111: projection

112: rotation delay unit 113: hinge groove

120: switch cover 114: retin spring hanger                 

116: engaging hole 120: switch cover

130: solenoid 131: electric wire

132: Plunger L: Slider Jam Position

UL: Slider Unlock Position

The present invention relates to a door lock switch of a washing machine, and more particularly, to a door lock switch of a washing machine in which a safety lever forcibly turns off the switch to cut off current input to a motor or the like when the door is forcibly opened.

In general, a washing machine uses washing, rinsing, and washing to remove contaminants on clothes, bedding, etc. (hereinafter, referred to as 'foam') by using detergent dissolved water or clean water (hereinafter referred to as 'washing water'). It is a device for washing laundry through the process of dehydration.

1 is a perspective view of a washing machine according to the prior art, Figure 2 is a control block diagram of a washing machine according to the prior art.

1 and 2, a washing machine according to the prior art, a casing (2) having a laundry entrance hole, a tub that is installed to be buffered inside the casing (2) to contain wash water, and the tub A drum (10) rotatably installed inside to accommodate the cloth, a motor (12) mounted on the tub to rotate the drum (10), a water supply unit (14) for supplying wash water to the tub, And a drainage device 16 for draining the contaminated wash water in the tub, so that the drum 10 rotates in the tub, thereby cleaning the laundry contained in the drum.

The casing 2 is provided with a door 4 for opening and closing the laundry access hole and a door lock switch 6 for maintaining the closed state of the door 4.

The door lock switch 6 locks or unlocks the hook 5 installed in the door 4 according to a signal from the control unit 20. In the state where no current is applied to the door lock switch 6, the user The door 4 can be opened and closed freely, and in a state where a current is applied to the lock switch 6, the door lock switch 6 prevents the hook 5 from being detached so that the door 4 can not be opened arbitrarily. do.

On the other hand, when the washing machine forcibly pulls the door 4 in a state in which a current is applied to the door lock switch 6, the hook 5 pushes the door lock switch 6 out of the door 4. May occur, the door switch 8 for detecting the opening of the door 4 so that the current is not input to the motor 12 or the like when the door 4 is forcibly opened. It is mounted to the casing 2 separately from the lock switch 6.

Reference numeral 22 is a control panel for inputting an operation command such as washing / rinsing / dehydrating to the washing machine.

However, the washing machine is equipped with the door switch 8 is made separately from the door lock switch 6, there is a complicated problem that not only the structure of the casing (2) side, but also the number of assembly labor increases.

The present invention has been made to solve the above problems of the prior art, it is not necessary to separately install a door switch for detecting the opening and closing of the door to the washing machine door lock switch of the washing machine that can simplify the structure of the washing machine The purpose is to provide.

Door lock switch of the washing machine according to the present invention for solving the above problems and the switch casing; A slider movably disposed on the switch casing such that a hook of the door can be engaged / released by the switch casing; A locking pin installed to lock / unlock the slider; A bimetal provided to move the locking pin between a slider locking position and a slider locking release position; A switch provided to be in contact when the locking pin is moved to a slider locking position; And a safety lever for moving the locking pin so that the contact point of the switch falls upon forcibly opening the door.

In addition, one end of the safety lever is rotatably connected to the switch casing, the other end is extended to be in contact with the hook of the door, one side is characterized in that a projection for pressing the locking pin protrudes.                     

In addition, the other end of the safety lever is characterized in that the rotation delay unit for delaying the rotation of the safety lever so that the slider is not caught in the projection when the door starts to open.

The door lock switch of the washing machine may further include a return spring that pulls the safety lever in the door opening direction.

The door lock switch of the washing machine may further include a heater installed to heat the bimetal.

The switch may include a fixed contactor electrically connected to an electric drive unit installed in the washing machine, and a movable contact unit installed in the bimetal and electrically connected to a current supply unit for supplying current to the electric drive unit.

The door lock switch of the washing machine may further include a solenoid that deforms the bimetal to move the locking pin to a slider locking position.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view of a washing machine with a door lock switch according to the present invention.

As shown in FIG. 3, the door lock switch 50 is mounted next to the laundry access hole 53 of the casing 52, and the hook 55 of the door 54 for opening and closing the laundry access hole 53. Lock / Unlock

In addition, the door lock switch 50 is configured to block a current input to a motor or a water supply device and a drainage device (hereinafter, referred to as an electric drive device) installed in the washing machine 52 when the door 54 is forcibly opened. The circuit is constructed.

Reference numeral 56 denotes a drum installed inside the washing machine 52 to wash / rinse / dehydrate laundry, and reference numeral 57 denotes a lifter mounted on an inner surface of the drum 56 to lift and drop laundry. , Reference numeral 58 is a control panel for operating the washing machine.

4 is a cross-sectional view showing the first embodiment of the door lock switch when the door shown in FIG. 3 is unlocked, and FIG. 5 is the first embodiment of the door lock switch when the door shown in FIG. 3 is locked. 6 is a cross-sectional view showing the first embodiment of the door lock switch when the door shown in FIG. 3 starts to be forcibly opened, and FIG. 7 is a door lock switch after the door shown in FIG. 3 is forcibly opened. The first embodiment is a sectional view shown.

As shown in FIGS. 4 to 7, the door lock switch 50 includes a switch casing 60 and a hook 55 of the door 54 on the switch casing 60 to be locked / released. A slider 70 movably disposed on the switch casing 60, a locking pin 80 provided to lock / unlock the slider 70, and the locking pin 80 with a slider locking position L; The bimetal 90 provided to move between the slider locking release position UL, the switch 100 provided to contact when the locking pin 80 moves to the slider locking position L, and the door 54 ), The safety lever 110 for moving the locking pin 80 so that the switch 100 is released when the force is opened, and the return spring 120 that pulls the safety lever 110 in the door 54 opening direction. It is configured to include).

The switch casing 60 is fixed by fastening means such as fastening bolts next to the laundry access hole 53 of the casing 52.

The switch casing 60 has an insertion hole 61 into which the hook 55 is inserted, and one side 62 of the insertion hole 61 is inclined to slide the hook 55.

The switch casing 60 is formed with a return spring hook rod 63 to which one end of the return spring 120 is engaged.

The switch casing 60 is equipped with a spring 64 which is tensioned when the slider 70 is retracted by the hook 55 and restored when the hook 55 is removed from the insertion hole 54. do.

One end of the spring 64 is fixed to the latching jaw 65 formed on the switch casing 60, and the other end of the spring 64 is fixed to the slider 70.

A hinge pin 66 is formed on the switch casing 60 opposite to the insertion hole 61 so that the safety lever 110 can be hinged.

In addition, the switch casing 60 is formed to protrude a safety lever retainer 67 to prevent the safety lever 110 from being separated.

The hook 55 is installed on the door 54 so as to be rotated by a predetermined angle and is supported by a return spring embedded in the door.

The slider 70 has an insertion hole 71 into which the hook 55 is inserted.

The slider 70 has a first protrusion 72 bent to one side of the insertion hole 71 so that the slider 70 is pushed by the hook 55.

The slider 70 has a second protrusion next to the other side of the insertion hole 71 so as to limit the left and right movement of the hook 55 when the hook 55 is caught in the door opening direction to the switch casing 60. 73 is bent and formed.

The locking pins 80 are formed with upper and lower hook portions 81 and 82 to which a part of the bimetal 90 is inserted and engaged.

The bimetal 90 is composed of two metal plates 91 and 92 having different thermal expansion coefficients and in close contact with each other, and the two metal plates 91 and 92 are installed to be heated by a heater 93 installed in the switch casing. .

One end of the two metal plates 91 and 92 is fixed to the heater 93 or the switch casing 60, and the other end thereof is caught between the upper and lower hook portions 81 and 82 of the locking pin 80. Is located.

The heater 93 is made of any one of various heaters such as the PTC ceramic heater and the coil heater installed in the switch casing 60.

The switch 100 may include a fixed contactor 101 electrically connected to an electric drive unit installed in a washing machine, and a movable contact unit installed in the bimetal 90 and electrically connected to a current supply unit for supplying current to the electric drive unit. 102).                     

One end of the safety lever 110 is rotatably connected to the switch casing 60, the other end extends to contact the hook 55, and a protrusion 111 for pressing the locking pin 80 on one side thereof. Protrudes.

At the other end of the safety lever 110, the rotation delay unit 112 delays the rotation of the safety lever 110 when the door 54 starts to open so that the slider 80 is not caught by the protrusion 111. ) Is formed.

The rotation retardation part 112 includes an inclination part 112a in which the head portion 55a of the hook 55 slides, and a stepped part extending from the inclination part 112a to be stepped with another part of the safety lever. And 112b.

One end of the safety lever 110 is formed with a hinge groove 113 into which a hinge pin 66 of the switch casing 80 is rotatably inserted.

The safety lever 110 is formed with a return spring hook rod 114 to which the other end of the return spring 120 is engaged.

The safety lever 110 is formed with a locking hole 116 to which the safety lever retainer 67 is locked so that over-rotation thereof is limited.

Reference numeral 120 denotes a switch cover which is coupled to the switch casing 60.

Looking at the operation of the present invention configured as described above are as follows.

First, after the laundry is put into the drum 56, the door 54 is rotated so that the door 54 blocks the laundry access hole 53, and the hook 55 has a head 55a. As shown in FIG. 5, the first protruding portion 72 of the slider 70 is laterally penetrated through the insertion hole 61 of the switch casing 60 and the insertion hole 71 of the slider 70. And the safety lever 110 is pushed in the door closing direction to allow the safety lever 110 to rotate at a predetermined angle about the hinge rod 66.

The slider 70 tensions the spring 64 while sliding sideways by the hook 55, and the second protrusion 73 moves left and right of the hook 55 as illustrated in FIG. 5. The head 55a of the hook 55 is caught in the door opening direction next to the insertion hole 61 of the switch casing 60.

Thereafter, when the user operates the washing machine, the washing machine applies current to the heater 93 to lock the door 54.

The heater 93 generates heat when an electric current is applied to heat the bimetal 90, and the bimetal 90 has thermal expansion due to a difference in thermal expansion between the two metals 91 and 92, as shown in FIG. 5. It is bent in the direction of a small metal, wherein the movable contact 102 is in contact with the fixed contact 101.

When the movable contact 102 and the fixed contact 101 are in contact, an electric drive device such as a motor of the washing machine, a water supply device, or a drainage device is in a state in which current can be applied from the current supply unit.

Meanwhile, as shown in FIG. 5, the bimetal 90 rotates the locking pin 80 to a slider latching position L while bending, so that the locking pin when the slider 70 is to be returned to its original position. And the slider 70 is positioned such that the second protrusion 73 restricts the left and right movement of the hook 55, thereby locking the hook 55 and locking the door 54. Maintain state.

The washing machine is driven in the state in which the door 54 is locked as described above, the electric drive is driven to perform various strokes such as washing, rinsing, dehydration, drying input by the user.

On the other hand, the washing machine is a door open with the door 54, as shown in Figure 6, when the door 54 is strongly pulled forward while the above-described stroke is in progress, Direction, the head portion 55a pushes the second protrusion 73 of the slider 70 in the opposite direction when the hook 55 is inserted, and the inclined portion 112a of the rotation retardation portion 112. After sliding along the contact with the step (112b).

Then, when the door 54 is continuously pulled, the hook 55 has the head portion 55a of the insertion hole 71 and the switch casing 60 of the slider 70 as shown in FIG. The insertion hole 61 of the

At this time, the safety lever 110 is rotated in the opening direction of the door 54 by the compression force of the return spring 120, the projection 111 by pressing the locking pin 80 to press the locking pin 80 Moving forward, the locking pin 80 deforms the bimetal 90 to a shape prior to thermal expansion (ie, non-expanded shape), wherein the contact of the stationary contact 101 and the movable contact 102 is Falls.                     

When the contact point of the fixed contactor 101 and the movable contactor 102 falls, no electric current is applied to an electric drive device such as a motor of the washing machine, a water supply device, or a drainage device, and the driving of the electric drive device is stopped.

Thereafter, when the door 54 is rotated again so that the door 54 blocks the laundry access hole 53, the head 55a of the hook 55 is shown in FIG. The first protrusion 72 of the 70 is slid sideways to reach the position where the second protrusion 73 restricts the left and right movement of the hook 55, and push the safety lever 110 in the door closing direction. The safety lever 110 is locked in the door opening direction next to the insertion hole 61 of the switch casing 60 while rotating the predetermined angle about the hinge rod 66.

The locking pin 80, which was pressed by the protrusion 111 when the safety lever 110 is rotated, is moved to the slider locking position L by bending due to thermal expansion of the bimetal 90. The contactor 101 and the movable contactor 102 are contacted again by the bending due to thermal expansion of the bimetal 90. The electric drive device such as a motor, a water supply device, or a drainage device of the washing machine can apply current from a current supply unit. It becomes a state.

Thereafter, when the user restarts the washing machine, the electric drive unit is restarted, and various strokes such as washing, rinsing, dehydration, and drying are performed, and when all the strokes input by the user are finished, the heater 93 Off.

When the heater 93 is turned off, the bimetal 90 is cooled and restored to a shape before thermal expansion (that is, a shape that is not thermally expanded), and the contact between the fixed contact 101 and the movable contact 102 falls so that the electric The current is not applied to the driving device, and the locking pin 80 is moved to the slider latch release position UL by the bimetal 90.

Then, when the user pulls the door 54 again to take out the laundry, the head portion 55a of the hook 55 inserts the second protrusion 73 of the slider 70 when the hook 55 is inserted. Sliding along the inclined portion (112a) of the rotation retardation portion 112 while pushing in the opposite direction of the contact with the step (112b), the insertion hole portion 71 and the switch casing 60 of the slider 70 The insertion hole 61 of the step out of the.

FIG. 8 is a cross-sectional view illustrating a second embodiment of the door lock switch when the door illustrated in FIG. 3 is unlocked, and FIG. 9 illustrates a second embodiment of the door lock switch when the door illustrated in FIG. 3 is locked. 10 is a sectional view showing a second embodiment of the door lock switch when the door shown in FIG. 3 starts to be forcibly opened, and FIG. 11 is a door lock switch after the door shown in FIG. 3 is forcibly opened. The second embodiment is a sectional view shown.

The door lock switch 50 according to the present embodiment further includes a solenoid 130 that deforms the bimetal 90 to move the locking pin 80 to the slider locking position U, and the solenoid ( Other configurations and operations other than 130) are the same as in the first embodiment of the present invention, and the same reference numerals are used, and detailed description thereof will be omitted.

The solenoid 130 is composed of a wire 131 wound in a spiral shape, and a plunger 132 that deforms the bimetal by a magnetic field formed in the wire.

As shown in FIG. 9, when the current is applied to the heater 93, the door lock switch 50 is applied to the wire 131 of the solenoid 130 so that the plunger 132 is advanced. The advanced plunger 132 bends one side of the bimetal 90 in the direction of the fixed contactor 101 so that the fixed contactor 101 and the movable contactor 102 are contacted more quickly and reliably.

In addition, the door lock switch 50, as shown in Figure 11, when the locking pin 80 is forcibly pressed by the protrusion 111 of the safety lever 110, the plunger of the solenoid 130 132 is pressed together with the bimetal 90 to enable current interruption by the safety lever 110.

In the door lock switch of the washing machine according to the present invention configured as described above, the safety lever moves the locking pin when the door is forcibly opened, and when the locking pin moves, the contact of the switch is cut off so that the current is applied to the electric drive device. There is no need to install the door switch of the washing machine has the advantage of simplifying the structure.

In addition, the door lock switch of the washing machine is further configured to further include a solenoid installed to deform the bimetal, there is an advantage that the current is quickly applied to the electric drive device.

Claims (7)

A switch casing 60; A slider (70) movably disposed on the switch casing (60) such that the hook (55) of the door (54) is caught or released from the switch casing (60); A locking pin (80) installed to lock or release the slider (70); A bimetal (90) installed to move the locking pin (80) between a slider locking position (L) and a slider locking release position (UL); A switch 100 installed to be in contact when the locking pin 80 is moved to the slider locking position L; The door lock switch of the washing machine comprising a safety lever (110) for moving the locking pin (80) so that the contact of the switch (100) when the forcible opening of the door (54). The method of claim 1, One end of the safety lever 110 is rotatably connected to the switch casing 60, the other end of the safety lever 110 extends to contact the hook 55 of the door 54, and one side of the locking pin 80 is provided. Door lock switch of the washing machine protruding projections (111) for pressing the. The method of claim 2, At the other end of the safety lever 110, the rotation delay unit 112 which delays the rotation of the safety lever 110 so that the slider 70 is not caught by the protrusion 111 when the door 54 starts to open. Lock switch of the washing machine formed. The method of claim 1, The door lock switch of the washing machine further comprises a return spring (120) for pulling the safety lever 110 in the door opening direction. The method of claim 1, The door lock switch of the washing machine further comprises a heater (93) installed to heat the bimetal (90) door lock switch of the washing machine. 6. The method according to any one of claims 1 to 5, The switch 100 and the fixed contact 101 is electrically connected to the electric drive device installed in the washing machine; The door lock switch of the washing machine is installed in the bimetal (90) and composed of a movable contact (102) electrically connected to a current supply for supplying current to the electric drive device. The method of claim 1, The door lock switch of the washing machine further comprises a solenoid (130) installed to deform the bimetal (90) door lock switch of the washing machine.

Images